Regarding Elsa's weight... The woman is a tank.
Keep in mind that guys who put on a lot of muscle the natural way also wind up with quite a bit of fat to go with it. This is because the human body has been engineered through the process of natural selection to keep reserves that are proportional to our metabolism, which itself is proportional to our muscle mass. The more you have to maintain, the faster your metabolism, and the more your body tries to keep in reserve.
This is why guys who have relatively little muscle mass look so scrawny, and guys who do strength training (the proper way) look so damn thick.
The same applies to women, except they don't tend to build as much muscle mass as men do. Instead, in the muscle-to-fat ratio, they skew a little bit closer to the fat side because natural selection filtered out the others that don't skew that way. Why? Because women that store more fat have an easier time producing healthy infants. Not that a woman who is naturally petite can't, but they'll tell you straight up they couldn't stop eating while they were pregnant.
Not that a more robust woman doesn't experience an increase in appetite, but a smaller woman would probably be destroying all-you-can-eat buffets left and right during her pregnancy, and all to account for the fact she didn't have much in reserves beforehand.
So with a woman as tanky as Elsa? I wouldn't be shocked if she was tipping the scales as much as 80kg/175lbs. (She's also probably close to pushing 175cm/5'9" in height.)
Especially since she's supporting a bust that huge! Even women who've built-up a strong set of core muscles will have back aches with breasts that big. It's why you usually only see that on women who are especially thick. Just like big men, they have to have more developed core muscles - and the fat to go with them - to support that kind of upper-body mass.